Superconducting Pairs with Extreme Uniaxial Anisotropy in URu2Si2

M. M. Altarawneh; N. Harrison; G. Li; L. Balicas; P. H. Tobash; F. Ronning; E. D. Bauer

doi:10.1103/PhysRevLett.108.066407

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Superconducting Pairs with Extreme Uniaxial Anisotropy in URu2Si2

M. M. Altarawneh, N. Harrison, G. Li, L. Balicas, P. H. Tobash, F. Ronning, E. D. Bauer

DOI 10.1103/PhysRevLett.108.066407 · Physical Review Letters

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Abstract

We report magnetic field orientation-dependent measurements of the superconducting upper critical field in high quality single crystals of URu2Si2 and find the effective g factor estimated from the Pauli limit to agree remarkably well with that found in quantum oscillation experiments, both quantitatively and in the extreme anisotropy (≈103) of the spin susceptibility. Rather than a strictly itinerant or purely local f-electron picture being applicable, the latter suggests the quasiparticles subject to pairing in URu2Si2 to be “composite heavy fermions” formed from bound states between conduction electrons and local moments with a protected Ising behavior. Non-Kramers doublet local magnetic degrees of freedom suggested by the extreme anisotropy favor a local pairing mechanism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown